Now to a shocking mystery rocking Virginia tech. A 21-year-old senior is dead. A fellow female student, charged with killing her. The motive unknown. And Mara skaf voe cchiavocampo has the story. Reporter: It's a mystery. A well-liked student at Virginia tech murdered. Another student and two others facing charges. 21-year-old senior and biology major samanata shrestha, known as Sam, was killed over the weekend. Something is wrong. That was my immediate reaction. Me and my husband. I said, this is not right. Reporter: Now, fellow senior, 2-year-old Jessica Ewing is behind bars, accused of murder murderimurd murdering shrestha. In court documents obtained by a newspaper, police say shrestha's body was in the backseat wrapped in a sleeping bag. They say Ewing called on Keefe Ek Kyle brown and Michael heller to help her. People reach out to friends and associates to help them. Reporter: None of the students has entered a plea. They did not return questions for comment. For "Good morning America," Mara schiavocampo, ABC news, new

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